If it hasn't been in the water since 82, your rigging might be fine depending on how it was stored. That's 40 less years of outside exposure, shock-loading, and other problems that age the rigging and eventually require replacement. It's worth the close look and inspection. That said, you've also got the mast down now... it's a good time to take care of all the preventative maintenance.?
One thing I will caution is that if you're missing parts, it might make sense to back into full replacement of the stays/shrouds. It could be pretty difficult to piece together a full kit between old parts and modern components. Not to mention, you'd then have new strong parts and older (slightly weaker) parts working together in the same system.?
Hopefully it's all there, and hopefully after being out of the water for 40 years, it's still in pretty good shape.?